KNIGHTS ARMAMENT SR-15 IWS 5.56 NATO Lower Receiver Assembly Kit | Black

Timber Creek Greyman Complete AR-15 Build Kit Black - G LPK BL

White Label Armory WLA-LOW-1015-01 Lower Parts Kit For AR-15 Black

AERO PRECISION AR15 5.56 NATO / 223 Rem 20" Complete Upper Receiver w/ Carry Handle | Black

BATTLE ARMS Workhorse Upper Recv 5.56 16" AR-15 Sniper Gray

APF AR-15 Stripped Billet Lower Receiver - Matte Black

BATTLE ARMS Authority ELite Upper Recv 5.56 10.5" AR-15 Gray

BATTLE ARMS Workhorse Upper Recv 5.56 16" AR-15 Sniper Gray